[Bug 120181] After start firefox in the Second Screen, firefox refuse to start in the main screen if it is still opened in the second screen

[Xing Dongsheng]

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I am using 7.04x86_64. I edited /etc/X11/xorg.conf to use double monitors.
I started firefox in the second screen to browse this web site.
I did not close firefox. I clicked the firefox icon in the main screen .
But firefox refuse to start. It said"Firefox is already running,but is not responding. ..... restart your system" -_-

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New

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After start firefox in the Second Screen, firefox refuse to start in the main screen if it is still opened in the second screen
https://bugs.launchpad.net/bugs/120181